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Version 0.7.2

A variety of mostly minor improvements and bug fixes over v0.7.1.

segment, gainloss, segmetrics:

    - Don't exclude very-low-coverage bins from calculations by default;
      instead, expose this option as `--drop-low-coverage`. (This option
      usually helps on tumor samples with some normal contamination, but leads
      to problems on germline samples with homozygous deletions.)

segment:

    - Output .cns files now have a "weight" column which is the mean of the
      weights of the bins it covers.
    - Output of the 'haar' segmentation method now has each segment's gene
      names listed, as with the other methods.
    - Fixed a bug where every segment's probe count (the "probes" column) could
      be overwritten with the `_` character. (#53; thanks @chapmanb)

segmetrics:

    - Each statistic is now printed in its own column, instead of squeezing all
      stats into the "gene" column. The confidence/prediction interval stats
      get two columns, `_lo` and `_hi` (lower and upper bound).

loh, scatter:

    - Given a VCF called on a tumor-normal pair, use the paired normal to
      select appropriate germline SNPs for plotting.

export:

    - New format "nexus-ogt" combines bin-level copy number ratios with
      b-allele frequencies given a VCF and a .cnr file. This replaces
      "nexus-basic" with the `-v` option that was introduced in v0.7.1;
      "nexus-ogt" stores the same info but can be viewed in BioDiscovery Nexus
      Copy Number without any special configuration (load it as the
      "Custom-OGT" data format).
    - Renamed `bed` option `--show-neutral` to `--show-all`.
    - `vcf` option `-g`/`--gender` now works properly for identifying CNVs on
      sex chromosomes.

call:

    - Fixed the `threshold` method to calculate absolute copy number on sex
      chromosomes correctly (#49; thanks @tskir).